US3735321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermistor
Assignee: General Electric Co
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Filing: 1971-06-18
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Granted: 1973-05-22
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Expires: 1991-06-18
Abstract
Abstract A thermistor is formed from a mass of fine particle diamonds, cubic boron nitride, silicon carbide, or mixtures thereof, the particles being doped with boron or beryllium to reduce their electrical resistivity. The thermistor is fabricated by positioning contacts in the mass and sintering at a temperature of at least 1,300* C under pressure conditions such that the particles are stable in the crystalline form they had immediately prior to the sintering step.
Inventors
- 👤 H Bovenkerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:41
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
13 words
A thermistor as claimed in claim 1 wherein the powder is doped diamond.
Claim 2
Dependent Claim
15 words
A thermistor as claimed in claim 1 wherein the powder is doped cubic boron nitride.
Claim 3
Dependent Claim
14 words
A thermistor as claimed in claim 1 wherein the electrodes are composed of molybdenum.
Claim 4
Independent Claim
96 words
The method of making a thermistor which comprises charging a reaction chamber of an ultra-high pressure apparatus with a mass of particles selected froM the group consisting of doped diamond powder, doped cubic boron nitride powder, doped silicon carbide powder, and mixtures thereof, positioning a pair of electrodes extending from the interior of said mass in spaced relationship, and sintering said mass at a temperature of at least 1,300* C under pressure conditions in the region of the phase diagram in which said particles are stable in the crystalline form they had immediately prior to sintering.
Claim 5
Dependent Claim
13 words
A thermistor as claimed in claim 5 wherein the powder is doped diamond.
Claim 6
Dependent Claim
15 words
A thermistor as claimed in claim 5 wherein the powder is doped cubic boron nitride.
Claim 7
Dependent Claim
14 words
A thermistor as claimed in claim 5 wherein the electrodes are composed of molybdenum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |